Massage sofa special for magnetic therapy

By designing the sliding block unit and the rotary massage ring unit in the magnetic therapy massage sofa, it is ensured that the permanent magnet block is always close to the user's back, which solves the problem that permanent magnets are difficult to face the back in the prior art, and improves the magnetic therapy effect and the stability and flexibility of the massage ring unit.

CN119924666APending Publication Date: 2025-05-06HEYE HEALTH TECH CO LTD
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Patent Information

Application Number
CN202510186390.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-02-20
Publication Date
2025-05-06

AI Technical Summary

Technical Problem

During the use of existing magnetic massage sofas, the permanent magnet is difficult to face the user's back when the swing arm structure rotates, resulting in a decrease in the effectiveness of magnetic therapy.

Method used

A massage sofa including a backrest frame side panel, a backrest skin and a permanent magnet block are designed, and the permanent magnet block is ensured that the permanent magnet block is always close to the user's back through the rotary massage ring unit through the sliding block unit and a connecting rope arranged on the backrest frame side panel.

Benefits of technology

The permanent magnet is always close to the user's back during rolling massage, which improves the effect of magnetic therapy operation and improves the stability and flexibility of the massage ring unit.

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Abstract

The invention belongs to the technical field of functional sofas, and particularly relates to a massage sofa special for magnetic therapy. The massage sofa structurally comprises a backrest frame side plate, a backrest skin and a permanent magnet block, and further comprises a sliding block unit arranged on the backrest frame side plate and a connecting rope arranged on the sliding block unit, the rotary massage ring unit is arranged on the connecting rope in a sleeving manner, the permanent magnet blocks are arranged on the outer ring surface of the rotary massage ring unit, and the rotary massage ring unit is used for squeezing the back of a user in a manner of being separated from the backrest skin. The massage sofa at least has the beneficial effects that the massage sofa is always close to the permanent magnets and the back of a user during rolling massage, and necessary basic characteristics are provided for magnetic therapy operation.
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Description

Technical Field

[0001] The present application belongs to the technical field of functional sofas, and in particular to a massage sofa specially used for magnetic therapy. Background Art

[0002] Massage sofas dedicated to magnetic therapy are a relatively common functional sofa, and their main function is to provide massage and magnetic therapy to the user. Accordingly, the structural composition of the above-mentioned sofa products, in addition to the basic sofa frame, soft packing materials and leather materials, generally also includes massage components and permanent magnet blocks.

[0003] In common sofa products, multiple permanent magnets are usually integrated on the massage part. When the massage part squeezes and massages the user's back through the skin material, the permanent magnets can be close to the user's back, which is one of the basic conditions for the magnetic therapy function to take effect.

[0004] For example, the Chinese invention patent application with application publication number CN111529346A and application publication date 2020.08.14 discloses a magnetic therapy massage chair, whose structural components mainly include: a swing arm, a massage wheel, a magnetic therapy unit, a swing arm drive unit, a locking assembly, a control unit, and a control switch.

[0005] The advantages of the magnetic therapy massage chair in this invention patent application are mainly: improving the efficacy of magnetic therapy massage, reducing the overall size of the magnetic therapy massage chair, and being more suitable for home use.

[0006] However, in actual use, the magnetic therapy massage chair still has at least the following impractical problems, which are specifically manifested as follows: When the swing arm structure rotates, it will move with the permanent magnet. During the upward rotation of the swing arm structure, the permanent magnet will move further and further away from the user and it will be difficult for it to face the user's back, thereby reducing the above-mentioned magnetic therapy effect. For details, please refer to the attached Figure 2 , Attachment Figure 3 . Summary of the invention

[0007] The present application provides a massage sofa specially used for magnetic therapy, and the technical problem to be solved is: how to ensure that the permanent magnet is always facing and close to the user's back when the sofa is massaging the user's back.

[0008] The technical solution adopted by the present application to solve the above-mentioned problem is: a massage sofa specially used for magnetic therapy, the structure of which includes backrest frame side panels, backrest cover, and permanent magnet blocks, and also includes a sliding block unit arranged on the backrest frame side panels, a connecting rope arranged on the sliding block unit, and a rotating massage ring unit which is sleeved on the connecting rope and has the permanent magnet block on the outer ring surface and is used to squeeze the user's back by means of the backrest cover.

[0009] A further preferred technical solution is that the rotating massage ring unit includes a circular ring block sleeved on the connecting rope, a radial groove arranged on the outer ring surface of the circular ring block and used to install the permanent magnet block, and an outer ring sleeved on the circular ring block, covering the permanent magnet block and used to squeeze the user's back.

[0010] A further preferred technical solution is that the sliding block unit includes a block body for mounting the connecting rope, and a sliding hole and a driving screw hole arranged on the block body.

[0011] A further preferred technical solution is that the rotating massage ring unit further includes two blocking rings which are respectively arranged at two sides of the circular ring block and are threadedly connected to the outer ring.

[0012] A further preferred technical solution is that the rotating massage ring unit also includes a radial through groove for assembly and disassembly, which is arranged on the blocking ring and is used to pass the connecting rope.

[0013] A further preferred technical solution is that the rotating massage ring unit also includes a mounting groove arranged on one of the side surfaces of the circular ring block, a ball arranged on the mounting groove and used for rolling friction on the blocking ring of the adjacent rotating massage ring unit, and a limiting hole arranged on one of the blocking rings and used to expose the ball.

[0014] A further preferred technical solution is that the rotating massage ring unit also includes two shrinkage and deformation driving blocks which are arranged on the blocking ring and located on both sides of the radial through groove for assembly and disassembly and are relatively close to each other so as to remove the blocking ring from the outer ring.

[0015] A further preferred technical solution is that the rotating massage ring unit also includes two rotating force-applying grooves which are respectively arranged on two side surfaces of the radial through groove for assembly and disassembly and are used for rotating and disassembling the blocking ring.

[0016] A further preferred technical solution is that: a plurality of adjacent rotating massage ring units realize an overall synchronous rotation massage mode by means of the balls being inserted into the radial through grooves for assembly and disassembly of adjacent rotating massage ring units.

[0017] A further preferred technical solution is that the rotating massage ring unit further includes an annular groove which is arranged on the outer ring surface of the circular ring block and is provided with all the radial grooves.

[0018] The beneficial effects of this application include at least the following three points.

[0019] First, the massage sofa can always be close to the permanent magnet and the user's back during rolling massage, providing the necessary basic characteristics for magnetic therapy operation.

[0020] Second, the rotating massage ring unit itself has many advantages, such as stable and efficient rolling massage action, firm installation, and simple and convenient disassembly.

[0021] Thirdly, the overall movement and single rolling massage methods provided by the rotating massage ring unit have the advantages of flexibility and versatility. Several rotating massage ring units can provide a "cylindrical" rolling massage effect by synchronously rotating after being engaged. Compared with the "ring-shaped" rolling massage effect, this method has a relatively poor fit, but has a greater pressing intensity, which significantly improves the practicality of the massage sofa. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of this application.

[0023] Figure 2 This is a schematic diagram of the position of the connecting rope in this application.

[0024] Figure 3 This is a schematic diagram of the structure of the rotating massage ring unit in this application.

[0025] Figure 4 Schematic diagram of the position and shape of the installation slot in this application.

[0026] Figure 5 Schematic diagram of the position of the ball in this application.

[0027] Figure 6 Schematic diagram of the position and shape of the limiting holes in this application.

[0028] Figure 7 This is a schematic structural diagram of one of the blocking rings in this application.

[0029] Figure 8 This is a schematic diagram of the specific method of inserting the ball into the radial through groove for assembly and disassembly of adjacent rotating massage ring units in this application.

[0030] Fig. 9 It is a schematic diagram of the "cylindrical" rolling massage effect of several rotating massage ring units rotating synchronously in this application.

[0031] Fig.10 Schematic diagram of the structure of the sliding block unit in this application.

[0032] Fig.11 This is a schematic diagram of the position and shape of the drive block for shrinkage and deformation and the force application groove for rotation in this application.

[0033] Fig.12 Schematic diagram of the position and shape of the side panels of the backrest frame in this application.

[0034] Fig.13 This is a schematic diagram of the position and shape of the backrest soft pack sponge in this application.

[0035] In the figure, the meanings of the symbols are as follows.

[0036] Backrest frame side plate 11, backrest skin 12, permanent magnet block 13, seat cushion frame 14, seat cushion skin 15, drive screw 16, limit rod 17, drive motor 18, backrest soft sponge 19; Sliding block unit 1, connecting rope 2, rotating massage ring unit 3; Circular ring block 301, radial groove 302, outer ring 303, blocking ring 304, radial through groove 305 for disassembly and assembly, mounting groove 306, ball 307, limiting hole 308, driving block 309 for shrinkage and deformation, force groove 310 for rotation, annular groove 311; Block 101 , sliding hole 102 , driving screw hole 103 . DETAILED DESCRIPTION

[0037] The following description is merely a preferred embodiment of the present application and does not limit the scope of the present application.

[0038] like Figure 1-Figure 13 As shown, a massage sofa specially used for magnetic therapy, the structure includes a backrest frame side panel 11, a backrest cover 12, and a permanent magnet block 13, and also includes a sliding block unit 1 arranged on the backrest frame side panel 11, a connecting rope 2 arranged on the sliding block unit 1, and a rotating massage ring unit 3 which is sleeved on the connecting rope 2 and has the permanent magnet block 13 on the outer ring surface, and is used to squeeze the user's back by means of the backrest cover 12.

[0039] In this embodiment, the basic structure of the massage sofa includes: a backrest frame, a backrest soft-pack sponge 19, a backrest skin 12, a cushion frame 14, a cushion soft-pack sponge, and a cushion skin 15. The backrest frame and the cushion frame 14 are connected and fixed, the backrest skin 12 is tilted upward, the backrest soft-pack sponge 19 is an integral type, and a plurality of the rotating massage ring units 3 are all located on the backrest soft-pack sponge 19 and inside the backrest skin 12. Therefore, when the user's back is pressed on the backrest skin 12, the connecting rope 2 can be bent and tightened, thereby making the rotating massage ring unit 3 fit and press the user's back.

[0040] At this time, the two drive motors 18 are turned on, so that the connection rope 2 and all the rotating massage ring units 3 can move back and forth on the user's back to perform a squeeze massage. All the permanent magnet blocks 13 are installed on the rotating massage ring units 3, so the permanent magnet blocks 13 can be continuously, sufficiently close, and sufficiently close to the user's back.

[0041] When the massage sofa is in normal use, the backrest soft sponge 19 and the backrest skin 12 are pressed down by the user's back, and then become concave. When the user leaves, the backrest soft sponge 19 and the backrest skin 12 return to their initial state of being tilted upward and convex. During the entire process, the rotating massage ring unit 3 is always in close contact with the inner surface of the backrest skin 12 and will not enter the backrest soft sponge 19, that is, the backrest soft sponge 19 is an integral foaming type and is not easy to break. For details, please refer to the attached Fig.13 .

[0042] The rotating massage ring unit 3 includes a circular ring block 301 which is sleeved on the connecting rope 2, a radial groove 302 which is arranged on the outer ring surface of the circular ring block 301 and is used to install the permanent magnet block 13, and an outer ring 303 which is sleeved on the circular ring block 301, covers the permanent magnet block 13, and is used to squeeze the user's back.

[0043] In this embodiment, the main material of the rotating massage ring unit 3 is engineering plastic, and the shape of the radial groove 302 is circular, corresponding to the cylindrical or pancake-shaped permanent magnet block 13.

[0044] The material of the outer ring 303 can be elastic rubber, which has the following two functions: First, it makes the action of directly squeezing and massaging the user's back appropriately gentle, thus improving the comfort of the massage function; Second, the annular block 301 is elastically sleeved and fully connected thereto to prevent the permanent magnet block 13 from falling out of the radial groove 302 .

[0045] The sliding block unit 1 includes a block body 101 for mounting the connecting rope 2 , and a sliding hole 102 and a driving screw hole 103 arranged on the block body 101 .

[0046] In this embodiment, the inner sides of the two backrest frame side panels 11 are provided with: a driving motor 18, two limit rods 17, and a driving screw 16, so that the block 101 can perform reciprocating linear sliding along the inclined length direction of the backrest frame side panels 11.

[0047] Correspondingly, at this time, one string of the rotating massage ring units 3 can perform all-round massage and magnetic therapy operations on the upper and lower areas of the user's back.

[0048] The rotary massage ring unit 3 further includes two blocking rings 304 which are respectively arranged at two sides of the circular ring block 301 and are screwed to the outer ring 303 .

[0049] In this embodiment, one of the functions of the blocking ring 304 is to remove the restriction that the outer ring 303 must have relatively large elasticity. When the outer ring 303 is used together with two blocking rings 304, the outer ring 303 can be made of rubber with relatively small elasticity, thereby providing a relatively hard massage effect on the user's back.

[0050] At this time, threads are provided on the inner ring surface of the outer ring 303 and the outer ring surface of the blocking ring 304. The inner diameter of the outer ring 303 is 0.5-1.5 mm larger than the outer diameter of the annular block 301. The two blocking rings 304 fully clamp the annular block 301, so that: 1 annular block 301, 1 outer ring 303, 2 blocking rings 304, and 1 circle of permanent magnet blocks 13 can be stably installed as a whole.

[0051] On the other hand, the rotating massage ring unit 3 can be adjusted upwardly as needed along the length of the connecting rope 2, further improving the practicality and flexibility of the sofa massage effect. For example, before sitting down, the user can manually divide all the rotating massage ring units 3 into two groups, one on the left and one on the right, through the backrest cover 12, and then adjust the massage magnetic therapy function to: a targeted strengthening effect on both sides of the back.

[0052] Of course, for example, by further improving the connecting rope 2 and / or the rotating massage ring unit 3, the above manual operation mode can be completely upgraded to automation.

[0053] It should be noted that: during the up and down reciprocating movement of the connecting rope 2 and all the rotating massage ring units 3, a single rotating massage ring unit 3 may undergo disorderly and uncontrollable left and right displacement, which has a relatively small impact on the massage magnetic therapy effect and can be manually restored immediately.

[0054] The rotary massage ring unit 3 further includes a radial through groove 305 disposed on the blocking ring 304 and used for passing the connecting rope 2 through the connecting rope 2 for assembly and disassembly.

[0055] In this embodiment, the replacement cycle of the blocking ring 304 is significantly shorter than that of the ring block 301, because the two blocking rings 304 close to each other on two adjacent rotating massage ring units 3 will inevitably be squeezed against each other.

[0056] Therefore, one of the functions of the radial through groove 305 for assembly and disassembly is to facilitate the removal and replacement of the blocking ring 304 that is worn, cracked or deformed after the threaded connection with the outer ring 303 is released.

[0057] The length of the disassembly radial groove 305 is the difference between the outer radius and the inner radius of the blocking ring 304 , and its width is equal to the inner diameter of the blocking ring 304 and slightly larger than the diameter of the connecting rope 2 .

[0058] The rotating massage ring unit 3 also includes a mounting groove 306 arranged on one of the side surfaces of the circular ring block 301, a ball 307 arranged on the mounting groove 306 and used for rolling friction on the blocking ring 304 of the adjacent rotating massage ring unit 3, and a limiting hole 308 arranged on one of the blocking rings 304 and used for exposing the ball 307.

[0059] In this embodiment, a single rotating massage ring unit 3 includes two blocking rings 304, one thick and one thin, and the limiting hole 308 is arranged on the thinner blocking ring 304, so that: First, the ball 307, the mounting groove 306, and the limiting hole 308 correspond one to one in terms of position and quantity, ensuring that the ball 307 can roll but will not shift or fall; Second, the balls 307 can perform rolling friction on the thicker blocking rings 304 of the adjacent rotating massage ring units 3, so that the wear degree of the inevitable relative rotation between the adjacent rotating massage ring units 3 can be significantly reduced.

[0060] For example, it is precisely because of the provision of the ball 307 that the harsh friction sound that may occur when the plurality of rotating massage ring units 3 rotate and massage together can be greatly reduced.

[0061] It should be noted that: First, when the blocking ring 304 is replaced, all the balls 307 will fall off, and when the new blocking ring 304 is installed, the balls 307 need to be installed back together; Second, when the blocking ring 304 is replaced and the ball 307 is reinstalled, the thinner blocking ring 304 with the limiting hole 308 needs to be installed first, and then the thicker blocking ring 304 is installed; Third, in the length direction of the connecting rope 2 , there is no unique restriction on the left and right position of the circular ring block 301 compared to the outer ring 303 , and it is sufficient to ensure that the two blocking circular rings 304 are fully screwed to the outer ring 303 .

[0062] The rotating massage ring unit 3 also includes two shrinkage and deformation driving blocks 309 which are arranged on the blocking ring 304 and are located on both sides of the radial through groove 305 for assembly and disassembly, and are relatively close to each other so as to be used for removing the blocking ring 304 from the outer ring 303.

[0063] In this embodiment, the replacement cycle of the outer ring 303 and the blocking ring 304 is relatively short, for example, generally 1-3 years, while the replacement cycle of the ring block 301 is relatively long, for example, generally 3-5 years. The blocking ring 304 is replaced by first unthreading the outer ring 303 and then removing it one by one. The outer ring 303 is replaced by untying one end of the connecting rope 2 and then removing all the outer rings 303 together.

[0064] When removing and replacing the blocking ring 304, it itself may have been worn and deformed, and it is difficult to rotate normally on the outer ring 303 and release the screw connection. Therefore, the shrinkage and deformation driving block 309 is provided. Its working principle is: after the two shrinkage and deformation driving blocks 309 are force-applied, they approach each other, and the radial through grooves 305 for disassembly and assembly are telescopically deformed, so that the contour shape of the ring block 301 is no longer a regular circle, and the screw connection relationship with the outer ring 303 is directly released, so that the deformed blocking ring 304 can be quickly removed.

[0065] Of course, even if the blocking ring 304 is not deformed, it can also be disassembled using the above method, which is the role of the shrinkage and deformation driving block 309.

[0066] The rotary massage ring unit 3 further includes two rotation force-applying grooves 310 which are respectively arranged on two side surfaces of the detachable radial through groove 305 and are used for rotatably detaching the blocking ring 304 .

[0067] In this embodiment, the function of the rotation force application groove 310 is: When the blocking ring 304 is rotated to be installed or removed on the outer ring 303, the operator can manually rotate it at the radial groove 305 for assembly and disassembly, and the rotation force groove 310 is the specific rotation force application position, which saves the trouble of holding the larger entire ring block 301 for rotation and disassembly.

[0068] The shrinkage drive block 309 and the rotation force groove 310 are both located on the radially outer side of the annular block 301, thereby making the deformation amplitude larger and the force rotation action more labor-saving.

[0069] A plurality of adjacent rotating massage ring units 3 realize a massage mode of overall synchronous rotation by means of the rolling balls 307 being inserted into the radial through grooves 305 for assembly and disassembly of the adjacent rotating massage ring units 3 .

[0070] In this embodiment, the conventional and main operation mode of the rotating massage ring unit 3 is: independent rotation, fitting the contour of the user's back, and causing the entire connecting rope 2 to bend. This mode is the above-mentioned "ring-shaped" rolling massage effect, and the advantages are comfortable massage intensity and good fit.

[0071] The rotating massage ring unit 3 has another massage mode, namely the above-mentioned "cylindrical" rolling massage effect. At this time, a plurality of the rotating massage ring units 3 are close enough to each other, and one of the rolling balls 307 is inserted into the radial through groove 305 for assembly and disassembly of the adjacent rotating massage ring unit 3, so that the plurality of rotating massage ring units 3 rotate synchronously and are always parallel to each other, and a long section of stronger, integrated squeezing massage operation is performed on a specific position of the user's back in a "fragmented" manner.

[0072] The specific position may be, for example, the left and right side ribs, the left and right waist, etc. At this time, the left and right sides of the plurality of rotating massage ring units 3 that have been clamped into an integral cylindrical shape may be provided with existing common blocking and limiting structures, such as various clips, so that the cylindrical structure is difficult to separate and disintegrate spontaneously.

[0073] Therefore, the connection between the backrest frame side panel 11 and the backrest cover 12 is preferably a zipper connection and a Velcro connection, so as to ensure that the backrest cover 12 can be opened as needed, thereby properly exposing the rotating massage ring unit 3.

[0074] The rotary massage ring unit 3 further includes an annular groove 311 which is arranged on the outer ring surface of the annular block 301 and is provided with all the radial grooves 302 .

[0075] In this embodiment, 5-20 radial grooves 302 are provided on a single annular block 301, corresponding to the same number of permanent magnet blocks 13, to ensure that during the entire rotational massage process of the rotating massage ring unit 3, the permanent magnet block 13 is always facing and close to the user's back.

[0076] The annular groove 311 has the following two functions: First, the permanent magnet block 13 installed in the plug-in manner is partially exposed to facilitate plugging and unplugging. For details, please refer to the attached Figure 3 ; Second, a suitable deformation space is reserved on the radial inner side of the outer ring 303 so that the squeezing action on the user's back is relatively gentle, and the outer ring 303 can be inserted into the annular groove 311 in real time, dynamically and slightly.

[0077] The above detailed description of the implementation methods of the present application is made in conjunction with the accompanying drawings, but the present application is not limited to the above implementation methods. Various modifications can be made within the knowledge of ordinary technicians in the technical field without departing from the purpose of the present application. These are all non-creative modifications and are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A massage sofa specially used for magnetic therapy, comprising a backrest frame side plate (11), a backrest cover (12), and a permanent magnet block (13), characterized in that: It also includes a sliding block unit (1) arranged on the side plate (11) of the backrest frame, a connecting rope (2) arranged on the sliding block unit (1), and a rotating massage ring unit (3) sleeved on the connecting rope (2) and provided with the permanent magnet block (13) on the outer ring surface, and used for squeezing the back of the user by means of the backrest cover (12).

2. A massage sofa dedicated to magnetic therapy according to claim 1, characterized in that: The rotating massage ring unit (3) comprises a circular ring block (301) sleeved on the connecting rope (2), a radial groove (302) arranged on the outer ring surface of the circular ring block (301) and used to install the permanent magnet block (13), and an outer ring (303) sleeved on the circular ring block (301), covering the permanent magnet block (13) and used to press the back of the user.

3. A massage sofa dedicated to magnetic therapy according to claim 2, characterized in that: The sliding block unit (1) comprises a block body (101) for mounting the connecting rope (2), and a sliding hole (102) and a driving screw hole (103) arranged on the block body (101).

4. A massage sofa dedicated to magnetic therapy according to claim 3, characterized in that: The rotating massage ring unit (3) further comprises two blocking rings (304) which are respectively arranged at two sides of the circular ring block (301) and are screwed to the outer ring (303).

5. A massage sofa dedicated to magnetic therapy according to claim 4, characterized in that: The rotating massage ring unit (3) further comprises a radial through groove (305) for assembly and disassembly, which is arranged on the blocking ring (304) and is used for passing the connecting rope (2).

6. A massage sofa dedicated to magnetic therapy according to claim 5, characterized in that: The rotating massage ring unit (3) further comprises a mounting groove (306) arranged on one of the side surfaces of the circular ring block (301), a ball (307) arranged on the mounting groove (306) and used for rolling friction on the blocking ring (304) of the adjacent rotating massage ring unit (3), and a limiting hole (308) arranged on one of the blocking rings (304) and used for exposing the ball (307).

7. A massage sofa dedicated to magnetic therapy according to claim 5, characterized in that: The rotary massage ring unit (3) further comprises two shrinkage and deformation driving blocks (309) which are arranged on the blocking ring (304) and are located at both sides of the radial through groove (305) for assembly and disassembly and are relatively close to each other so as to be used for dropping the blocking ring (304) off the outer ring (303).

8. The massage sofa dedicated to magnetic therapy according to claim 5, characterized in that: The rotary massage ring unit (3) further comprises two rotation force-applying grooves (310) respectively arranged on two side surfaces of the radial through groove (305) for assembly and disassembly and used for rotationally assembling and disassembling the blocking ring (304).

9. The massage sofa dedicated to magnetic therapy according to claim 6, characterized in that: A plurality of adjacent rotating massage ring units (3) achieve a massage mode of overall synchronous rotation by means of the rolling balls (307) being inserted into the radial through grooves (305) for assembly and disassembly of adjacent rotating massage ring units (3).

10. The massage sofa dedicated to magnetic therapy according to claim 2, characterized in that: The rotating massage ring unit (3) further comprises an annular groove (311) which is arranged on the outer ring surface of the circular ring block (301) and is provided with all the radial grooves (302).

Citation Information

Patent Citations

  • Magnetic therapy massage chair

    CN111529346A